[Bug]: Linux PWA doesn't retain its PWA icon after loading, and reverts back the Floorp icon, and gets grouped with it.

[32bitx64bit]

Pre-Submission Checklist

• [X] I have checked the existing/closed issues to ensure this issue has not already been reported.
• [X] I am using the latest supported version of the browser.
• [X] I have tried disabling all browser extensions/add-ons to rule out interference from these.
• [X] I have tried clearing the browser cache and cookies.
• [X] I have tried to create a new profile and the issue still occurs.
• [X] I have provided detailed step-by-step instructions on how to reproduce the issue.
• [X] I have included relevant screenshots or console outputs.
• [X] I have checked this problem is not ocurring in the latest version of Firefox ESR.
• [X] This issue is specific to this browser and does not occur in other browsers.

Bug Summary

When you open a PWA via the taskbar / any other way (This example im on KDE), it will retain its icon until the webpage is fully loaded, then it reverts back to the Floorp icon, and gets grouped with it again.

Here's a video of it happening to better explain

https://github.com/Floorp-Projects/Floorp/assets/86190528/79fad40a-ffeb-4694-942f-6a07b202d406

Reproduction Steps

Install any PWA on Linux KDE.

Open PWA

Done.

Expected Behavior

Expected behavior should be like on windows where it retains its identity.

Actual Behavior

https://github.com/Floorp-Projects/Floorp/assets/86190528/66b4f5f2-7ee3-4c74-9258-3389cd732e11

Screenshots

https://github.com/Floorp-Projects/Floorp/assets/86190528/8b21f027-0ada-4987-bfe8-422e856c52ae

Browser Version

11.12.0

Operating System

Arch Linux KDE Plasma 6.0.3

Additional Context

No response